The story
1950s
The company's original factories are located in Ballard at 1400 N.W. 52nd Street and has a large neon sign on top of the building that would flash "ADD BARDAHL, ADD IT TO YOUR OIL, ADD IT TO YOUR GAS" and light up the image of a car when it was on. This sign would become a Ballard Landmark and was even featured in one of the intros for Almost Live! in the 1980s. In the mid-1950s, Bardahl was the leading brand of motor oil and oil additives in the United States. Bardahl's oil additive was advertised during the 1950s in magazines and animated TV commercials which showed the product's effectiveness in combating engine problems such as "Dirty Sludge" ("Mucky Sludge" in some commercials), "Sticky Valves," "Gummy Rings," "Seymour Pollution," and "Blackie Carbon," all of which were anthropomorphized in the commercials.
1960s
In the early 1960s York Research Corporation, an independent commercial testing laboratory of Glenbrook, Connecticut conducted controlled testing on Bardahl. As the result of those tests, York President Warren C. Hyer was featured in regional and national Bardahl television advertisements touting the benefits of Bardahl as an oil additive. For many years the York Research company seal could be found on all cans of Bardahl.
From Wikipedia’s article on Bardahl, shared under CC BY-SA 4.0.4